<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<title></title>
	<link rel="stylesheet" href="">
	<script type="text/javascript">
        function say(){
            alert("parent.html");
        }
        function callChild(){
            myFrame.window.say();
            myFrame.window.document.getElementById("button").value="调用结束";
        }
    </script>
</head>
<body>
	<input id="button" type="button" value="调用child.html中的函数say()" onclick="callChild()"/>
	<iframe name="myFrame" src="iframe_child.html"></iframe>
</body>
</html>